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You are here: Home » GMAT Test Prep Questions » Speed Time Races » Question 3

The question given below is a quant problem solving question in Speed Time and Distance.

Jim travels the first 3 hours of his journey at 60 mph speed and the remaining 5 hours at 24 mph speed. What is the average speed of Jim's travel in mph?

1. 42 mph
2. 36 mph
3. 37.5 mph
4. 42.5 mph
5. 48 mph

The correct choice is (C) and the correct answer is 37.5 mph.

Average speed =

Total distance traveled by Jim = Distance covered in the first 3 hours + Distance covered in the next 5 hours.

Distance covered in the first 3 hours = 3 * 60 = 180 miles
Distance covered in the next 5 hours = 5 * 24 = 120 miles

Therefore, total distance traveled = 180 + 120 = 300 miles.

Total time taken = 3 + 5 = 8 hours.

Average speed = = 37.5 mph.